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| | The Marie Byrd Land Dome: Volcanic and Uplift History, 34 Ma to Present |
 | | A second pattern, which involves ages of basalts resting on the WAES compared with their elevations, provides evidence that volcanic activity was accompanied by steady uplift, at a rate of ~105-122 m/my, between 8 Ma and 25 Ma. |
 | | Recent results from a study of the Dorrel Rock gabbro, in eastern MBL (Rocchi et al., in prep.) provide robust data for a 34 Ma age for this plutonic body, together with evidence that suggests mainly late Oligocene uplift and exhumation. |
 | | Petrologic studies suggests further, that the evolution from oversaturated to highly undersaturated products, observed in volcanoes of both basaltic and felsic compositions, reflects the deepening and increasing efficiency of a complex volcanic plumbing system that is evolving during dome growth (LeMasurier et al., in review). |
| www.geology.ohio-state.edu /agg-group/siena/geology/Le_Masurier.htm (335 words) |
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